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A restoration agent for reducing soil cadmium and lead effective state content and its use method and application

An effective state, remediation agent technology, applied in the field of heavy metal contaminated soil remediation agents, can solve the problems of poor fixation effect repetition rate, secondary pollution, low heavy metal fixation rate, etc. Effect

Active Publication Date: 2018-02-09
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently commonly used fixatives (restoratives, passivators) have the following problems: organic fixatives are prone to secondary pollution when treating heavy metal-contaminated soil; natural mineral fixatives have a relatively low fixation rate for heavy metals
Existing chemical fixatives rarely deal with heavy pollution, and the developed fixatives are only suitable for dealing with a certain type of limited soil. When chemical fixatives for acidic soils are applied to neutral or calcareous soils, the repeatability of the fixation effect bad
An effective fixative for moderately and lightly polluted soils, even if the dosage is increased, it has little effect on heavily polluted soils

Method used

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  • A restoration agent for reducing soil cadmium and lead effective state content and its use method and application
  • A restoration agent for reducing soil cadmium and lead effective state content and its use method and application
  • A restoration agent for reducing soil cadmium and lead effective state content and its use method and application

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Experimental program
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Effect test

Embodiment 1

[0037] A restoration agent for reducing soil cadmium and lead effective content of the present invention, the composition of the restoration agent comprises: quicklime, calcium sulfate, charcoal, ferric chloride and water, wherein quicklime, calcium sulfate, charcoal, ferric chloride and water The mass of the soil is 1%, 2%, 2%, 1%, 35% of the soil weight. Among them, calcium sulfate and ferric chloride are analytical reagents, excluding crystal water; charcoal is black charcoal fired from common wood in the market, and quicklime and calcium sulfate are both in powder form. The charcoal is crushed granules, and the particle size of the granules is 3 mm.

[0038] The use method of the remediation agent that reduces soil cadmium, lead effective state content of the present embodiment comprises the following steps:

[0039] (1) The heavy metal cadmium and lead polluted acidic soil in Zixing, Hunan Province (available cadmium content is 0.42mg / kg, available lead content is 19.76m...

Embodiment 2

[0046] A restoration agent for reducing soil cadmium and lead effective content of the present invention, the composition of the restoration agent comprises: quicklime, calcium sulfate, charcoal, ferric chloride and water, wherein quicklime, calcium sulfate, charcoal, ferric chloride and water The quality of each is 1%, 2%, 1%, 1%, 40% of the soil weight. Among them, calcium sulfate and ferric chloride are analytical reagents, excluding crystal water; charcoal is black charcoal fired from common wood in the market, and quicklime and calcium sulfate are both in powder form. The charcoal is crushed granules, and the particle size of the granules is 3mm.

[0047] The use method of the remediation agent that reduces soil cadmium, lead effective state content of the present embodiment comprises the following steps:

[0048] (1) Neutral soil polluted by heavy metal cadmium and lead in Shuikoushan, Hunan Province (available cadmium content is 0.73mg / kg, available lead content is 6.2...

Embodiment 3

[0055] A restoration agent for reducing soil cadmium and lead effective content of the present invention, the composition of the restoration agent comprises: quicklime, calcium sulfate, charcoal, ferric chloride and water, wherein quicklime, calcium sulfate, charcoal, ferric chloride and water The quality of the soil is 5%, 10%, 5%, 5%, 40% of the soil weight. Among them, calcium sulfate and ferric chloride are analytical reagents, excluding crystal water; charcoal is black charcoal fired from common wood in the market, and quicklime and calcium sulfate are both in powder form. The charcoal is crushed granules, and the particle size of the granules is 3 mm.

[0056] The use method of the remediation agent that reduces soil cadmium, lead effective state content of the present embodiment comprises the following steps:

[0057] (1) Neutral soil polluted by heavy metal cadmium and lead in Yuanling, Hunan Province (available cadmium content is 50.90 mg / kg, available lead content i...

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Abstract

The invention discloses a restoration agent for reducing the effective state content of cadmium and lead in soil. The composition of the restoration agent includes quicklime, calcium sulfate, charcoal, ferric chloride and water, wherein the composition of quicklime, calcium sulfate, charcoal and ferric chloride The weight ratio is 1~2:1~2:1~2:0.5~1, and the weight of water is 30~45% of the weight of soil. The invention can be used to treat heavily polluted soil, and the general chemical passivation agent is only limited to repairing mildly polluted soil, and the effect is not obvious when it is used for heavily polluted soil. The invention can be used to treat both acidic soil and soil with neutral pH. The invention has high repairing efficiency for cadmium-contaminated soil, and the reaction mechanism involves chemical precipitation and physical adsorption. In the case that one of the functions is lost due to changes in external conditions, the other function can play a protective role; and it can protect the contaminated soil. The effective state content of lead has a certain control effect.

Description

technical field [0001] The invention relates to a remediation agent for heavy metal polluted soil, in particular to a remediation agent for reducing the effective content of cadmium and lead in acidic / neutral soil and a use method thereof. Background technique [0002] Cadmium exists in the form of compounds in nature, there is no separate deposit, and it often coexists with zinc ore, lead-zinc ore, and copper-lead-zinc ore. Cadmium and lead are widely used in electroplating industry, chemical industry, electronics industry and nuclear industry and other fields. Cadmium and lead have high biological toxicity, latent persistence and irreversibility, and are more likely to be adsorbed by crops in soil than other heavy metals, and remain in plants. In recent years, soil cadmium and lead pollution incidents have occurred frequently in my country, such as the "cadmium rice" incident and children's blood lead exceeding the standard, which indicate that soil cadmium and lead pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/06B09C1/08
Inventor 李倩黄顺红陈伟袁翠玉欧阳坤万文玉万斯王兵欧阳全胜苏珍朱安玲游萍
Owner HUNAN RES INST FOR NONFERROUS METALS